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Property, Plant and Equipment (Tables)
12 Months Ended
Dec. 31, 2019
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
Depreciation is computed using the straight-line method over management’s estimated useful lives of the related assets. The estimated useful lives are as follows:
 
Years
Buildings and building improvements
15-40
Pipelines, tanks and terminals
15-40
Asset retirement obligation assets
15-50
Other equipment
3-15

Property, plant and equipment, at cost, consist of the following (in thousands):
 
December 31,
 
2019
 
2018
Land
$
4,458

 
$
4,458

Building and building improvements
1,853

 
3,695

Pipelines, tanks and terminals
427,287

 
410,154

Asset retirement obligation assets
2,073

 
2,073

Other equipment
16,634

 
15,838

Construction in process
9,020

 
16,528

Property, plant and equipment
461,325

 
452,746

Less: accumulated depreciation
(166,281
)
 
(140,184
)
Property, plant and equipment, net
$
295,044

 
$
312,562

Property, plant and equipment, accumulated depreciation and depreciation expense by reporting segment as of and for the years ended December 31, 2019 and 2018 are as follows (in thousands):
 
As of and For the Year Ended December 31, 2019
 
Pipelines and Transportation
 
Wholesale Marketing and Terminalling
 
Consolidated
Property, plant and equipment
$
354,429

 
$
106,896

 
$
461,325

Less: accumulated depreciation
(125,771
)
 
(40,510
)
 
(166,281
)
Property, plant and equipment, net
$
228,658

 
$
66,386

 
$
295,044

Depreciation expense
$
20,803

 
$
5,898

 
$
26,701


 
As of and For the Year Ended December 31, 2018
 
Pipelines and Transportation
 
Wholesale Marketing and Terminalling
 
Consolidated
Property, plant and equipment
$
361,702

 
$
91,044

 
$
452,746

Less: Accumulated depreciation
(106,971
)
 
(33,213
)
 
(140,184
)
Property, plant and equipment, net
$
254,731

 
$
57,831

 
$
312,562

Depreciation expense
$
21,115

 
$
4,786

 
$
25,901